Human beings have speculated about the relationship between inspiration and insanity for centuries.
— Patty Duke

There are two times in a man's life when he should not speculate: when he can't afford it, and when he can.
Mark Twain speculative quote

Speculative quotes
Picture quote about Speculative

A speculator is a man who observes the future, and acts before it occurs.
— Bernard Baruch

When speculation has done its worst, two and two still make four.
— Samuel Johnson

Life must be something more than dilettante speculation.
— speculative quotation by Anna Julia Cooper